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Simplifying 20x2 + -13a + -21 = 0 Reorder the terms: -21 + -13a + 20x2 = 0 Solving -21 + -13a + 20x2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + -13a + 21 + 20x2 = 0 + 21 Reorder the terms: -21 + 21 + -13a + 20x2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -13a + 20x2 = 0 + 21 -13a + 20x2 = 0 + 21 Combine like terms: 0 + 21 = 21 -13a + 20x2 = 21 Add '-20x2' to each side of the equation. -13a + 20x2 + -20x2 = 21 + -20x2 Combine like terms: 20x2 + -20x2 = 0 -13a + 0 = 21 + -20x2 -13a = 21 + -20x2 Divide each side by '-13'. a = -1.615384615 + 1.538461538x2 Simplifying a = -1.615384615 + 1.538461538x2
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